On Fri, Oct 05, 2018 at 07:49:49PM -0700, john.hubbard@xxxxxxxxx wrote: > From: John Hubbard <jhubbard@xxxxxxxxxx> > > For code that retains pages via get_user_pages*(), > release those pages via the new put_user_page(), or > put_user_pages*(), instead of put_page() > > This prepares for eventually fixing the problem described > in [1], and is following a plan listed in [2], [3], [4]. > > [1] https://lwn.net/Articles/753027/ : "The Trouble with get_user_pages()" > > [2] https://lkml.kernel.org/r/20180709080554.21931-1-jhubbard@xxxxxxxxxx > Proposed steps for fixing get_user_pages() + DMA problems. > > [3]https://lkml.kernel.org/r/20180710082100.mkdwngdv5kkrcz6n@xxxxxxxxxxxxxx > Bounce buffers (otherwise [2] is not really viable). > > [4] https://lkml.kernel.org/r/20181003162115.GG24030@xxxxxxxxxxxxxx > Follow-up discussions. > > CC: Doug Ledford <dledford@xxxxxxxxxx> > CC: Jason Gunthorpe <jgg@xxxxxxxx> > CC: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx> > CC: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> > CC: Christian Benvenuti <benve@xxxxxxxxx> > > CC: linux-rdma@xxxxxxxxxxxxxxx > CC: linux-kernel@xxxxxxxxxxxxxxx > CC: linux-mm@xxxxxxxxx > Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx> > --- > drivers/infiniband/core/umem.c | 7 ++++--- > drivers/infiniband/core/umem_odp.c | 2 +- > drivers/infiniband/hw/hfi1/user_pages.c | 11 ++++------- > drivers/infiniband/hw/mthca/mthca_memfree.c | 6 +++--- > drivers/infiniband/hw/qib/qib_user_pages.c | 11 ++++------- > drivers/infiniband/hw/qib/qib_user_sdma.c | 8 ++++---- > drivers/infiniband/hw/usnic/usnic_uiom.c | 7 ++++--- > 7 files changed, 24 insertions(+), 28 deletions(-) I have no issues with this, do you want this series to go through the rdma tree? Otherwise: Acked-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Thanks, Jason
